PSQI: Pittsburgh Sleep Quality Index

The Pittsburgh Sleep Quality Index (PSQI) is a 19-item self-report measure that evaluates sleep quality and disturbances over a one-month period. Validated tool for clinical sleep assessment and research.

What is the PSQI?

The Pittsburgh Sleep Quality Index (PSQI) is the most widely used clinical tool for assessing sleep quality. Developed by researchers at the University of Pittsburgh in 1989, the PSQI measures subjective sleep quality over the past month across seven components.

The 19 self-rated items generate scores for seven components: subjective sleep quality, sleep latency, sleep duration, habitual sleep efficiency, sleep disturbances, use of sleeping medication, and daytime dysfunction. Each component is scored 0-3, with the sum producing a global score ranging from 0-21.

A global PSQI score greater than 5 indicates "poor sleep quality" with high sensitivity and specificity for distinguishing good and poor sleepers. The PSQI is validated across clinical populations including insomnia, depression, PTSD, chronic pain, and sleep apnea.

Screening Tool, Not Diagnostic

The PSQI identifies poor sleep quality and patterns. A full clinical evaluation of sleep disorders (insomnia, sleep apnea, etc.) requires full clinical evaluation, often including sleep studies conducted by sleep specialists.

Public Domain

The PSQI is freely available for clinical and research use. No licensing fees are required, making it accessible for widespread adoption in healthcare settings.

How to Administer the PSQI

Self-Report Format

Patients complete the 19-item questionnaire independently, reflecting on their sleep patterns over the past month. Can be administered in-clinic or remotely via secure digital portals.

Administration Time

Typically takes 5-10 minutes to complete. Scoring requires calculating seven component scores and summing for a global score (0-21).

Regular Monitoring

Administer at intake and every 4-8 weeks during sleep treatment. The one-month timeframe makes monthly reassessment appropriate for tracking progress.

Instructions ask respondents to consider their sleep over the past month, providing a detailed view of sleep patterns rather than isolated nights.

Administration Best Practices

• Ensure patients understand the "past month" timeframe before starting
• Review component scores, not just the global score, to target specific sleep issues
• Combine with sleep diaries for detailed real-time sleep tracking
• Consider referral to sleep specialists if PSQI > 10 with severe daytime impairment

PSQI Scoring & Interpretation

Seven Component Scores (0-3 each)

Clinical Tip: Review individual component scores to identify specific targets for intervention (e.g., sleep medication overuse, poor efficiency, daytime impairment).

Monitoring Treatment Response

A reduction of 3 points or more on the global PSQI score is considered clinically meaningful improvement in sleep quality.

Track component scores over time to demonstrate intervention effectiveness (e.g., CBT-I reducing sleep latency, medication taper reducing sleep med use).

When to Refer

Consider sleep specialist referral if:

• PSQI > 10 despite behavioral interventions
• High sleep disturbance score + snoring or gasping (apnea risk)
• Severe daytime dysfunction affecting work/relationships

Component 1, Subjective Sleep Quality

Overall, how would you rate your sleep quality over the past month?

Component 2, Sleep Latency

How long does it usually take you to fall asleep?

How often have you been unable to get to sleep within 30 minutes?

Component 3, Sleep Duration

How many hours of actual sleep do you get per night?

Component 4, Habitual Sleep Efficiency

Approximately what percentage of time in bed are you actually asleep?

Component 5, Sleep Disturbances

How often in the past month have you had trouble sleeping because you…

Component 6, Sleep Medication

How often have you taken medicine (prescribed or over-the-counter) to help you sleep?

Component 7, Daytime Dysfunction

How often have you had trouble staying awake while driving, eating, or during social activities?

How much of a problem has it been to keep up enough enthusiasm to get things done?

Global PSQI Score

No clinical intervention needed, maintain your healthy sleep habits.

Your Estimated Sleep Night

Component Breakdown

Areas to Address

PSQI vs Other Sleep Assessment Tools

Different sleep assessment tools measure different aspects of sleep health. Understanding these differences helps you select the right tool for your clinical goals.

PSQI vs ISI: Sleep Quality vs Insomnia Severity

Clinical Guidance: The PSQI is a broad-spectrum sleep assessment, use it when you need a full picture of sleep health across multiple dimensions. The ISI is laser-focused on insomnia symptoms and their impact, use it specifically for insomnia screening and monitoring CBT-I (cognitive behavioral therapy for insomnia) treatment response. If sleep complaints are vague or you're screening for any sleep disorder, start with PSQI. If the patient clearly has insomnia, ISI is faster and more sensitive to treatment changes.

When to use PSQI: General sleep screening, multiple sleep concerns, research studies, detailed sleep disorder evaluation, unclear diagnosis.

PSQI vs ESS: Sleep Quality vs Daytime Sleepiness

Clinical Guidance: The PSQI and ESS measure opposite ends of the 24-hour sleep-wake cycle. PSQI assesses how well you sleep at night; ESS assesses how sleepy you are during the day. They're complementary, not interchangeable. Use PSQI for insomnia-type complaints ("I can't fall asleep," "I wake up frequently"). Use ESS when patients report excessive daytime sleepiness, snoring, or suspected sleep apnea, high ESS scores (>10) warrant sleep study referral for possible OSA.

Use both when: Patient has both sleep quality complaints AND daytime sleepiness. High ESS + high PSQI suggests a sleep disorder like sleep apnea is disrupting nighttime sleep AND causing daytime fatigue. This pattern warrants polysomnography (sleep study) referral.

PSQI vs Actigraphy: Subjective vs Objective Sleep Measurement

Clinical Guidance: PSQI and actigraphy provide different but complementary information. PSQI captures the patient's subjective experience, how they feel about their sleep, which directly relates to quality of life and mental health. Actigraphy provides objective data about actual sleep-wake patterns, useful when subjective reports are unreliable (cognitive impairment, paradoxical insomnia) or when you need circadian rhythm data. Standard practice: use PSQI for routine screening and treatment monitoring. Add actigraphy when diagnosis is unclear, circadian disorders are suspected, or objective validation is needed.

Clinical pearl: PSQI and actigraphy often disagree, this is normal and clinically informative. Patients who report poor sleep quality (high PSQI) but show normal sleep patterns on actigraphy may have paradoxical insomnia (sleep state misperception). This mismatch guides treatment toward CBT-I rather than sleep medications.

Documenting PSQI scores in clinical notes?

PSQI global and component scores belong in the Objective section of your note. See our SOAP notes guide and Intake Notes guide for templates and examples.